So while randomly browsing a deals website I came across a USB wifi router/hotspot on sale at Maplin for a mere £2.00 and as my tinkering desire took over I decided to order a couple. https://www.maplin.co.uk/p/maplin-3g-n150-wi-fi-router-and-hotspot-a26lw

These devices all appear very similar physically but your mileage my vary on functionality i.e they may have
A restricted bootloader that doesn’t allow OpenWrt images
Limited Busybox shell available by telnet
More complete Busybox shell

Board is marked A5-V12 and chip is an Ralink RT5350F. From my reseach I found other boards are marked A5-V11 so used that as a starting point.

While it's rebooting you'll need to set a static ip on your desktop interface that is connected to the device i.e
192.168.100.2
255.255.255.0

Once the deivce has rebooted it will be available via 192.168.100.1 and again telnet is enabled. === IMPORTANT ============================
Use 'passwd' to set your login password
this will disable telnet and enable SSH
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As these devices have so little free RAM once OpenWRT is up, I found the sysupgrade utility doesn’t work if the update image is copied to /tmp. The solution is to pipe the image via ssh directly into mtdwrite. From a fresh build of OpenWRT: